Realtek is best known for its onboard audio chips but now the company is also trying to break into the SSD controller market. Current-generation controllers include the RTS5762 and RST5763DL (DRAMless), and the firm also has a new USB to PCIe bridge controller that natively supports RGB lighting.
Tom's Hardware has some details about the RTS5771, which is supposed to hit the market in Q3 2020. This controller will use PCI Express 4.0:
The RTS5771 is Realtek's next-gen top-tier controller and it is aimed to hit the market sometime in Q3 2020. It will feature a multi-core, DRAM-based architecture, with a second-generation LDPC error correction engine as well as AES encryption. Performance stats aren’t yet available, but with eight NAND channels and NAND interface speeds of up to 1,200 MT/s and a PCIe 4.0 x4 host link, it should be quite potent.
Further details about the other controllers can be found over here.